Abstract:

It investigated the differences in the utilization of cottonseed protein and soybean meal as the sole protein source of diets by weaned piglets,respectively.Thirty healthy and similar weight ternary crossbred(Duroc×Yorkshire×Large white)weaned piglets at 28 days of age were selected and randomly divided into 5 groups(6 replicates per group,1 head per replicate),and single-pen feeding:with reference to the nutritional requirement standard of weaned piglets of NRC(2012),all the diets met the 10 essential amino acids(lysine,methionine,threonine,tryptophan, valine,isoleucine,leucine,arginine,histidine,phenylalanine),i.e.(1)20% SBM group:feeding corn+20% soybean meal based acid diet;(2)15% SBM group:feeding corn+15% soybean meal diet;(3)20% CSP group:feeding corn+20% cottonseed protein diet;(4)15% CSP group:feeding corn+15% cottonseed protein diet;(5)20% CSP+NE group:feeding corn+20% cottonseed protein.In addition to meeting the requirements of essential amino acids,the 20% SBM group was supplemented with non-essential amino acid content.The results showed that the 15% SBM group did not affect the growth performance,organ index and intestinal morphology of weaned piglets,significantly increased the fecal digestibility of multiple amino acids and significantly decreased the diarrhea index compared with the 20% SBM group.The 15% CSP group did not affect growth performance,organ index,diarrhea index,and intestinal morphology of weaned piglets,but significantly decreased fecal apparent digestibility of multiple amino acids and significantly increased 28 d serum Total protein (TP), Alanine aminotransferase (ALT), and Glucose (GLU) levels compared with the 15% SBM group.Compared with the 20% SBM group,the 20% CSP group did not affect piglet growth performance,organ indices,diarrhea indices,and intestinal morphology,but significantly decreased the digestibility of multiple amino acids.Compared with the 20% CSP group,the 20% CSP+NE group did not affect the growth performance,organ index,carcass composition,and intestinal morphology of weaned piglets,but significantly increased the total of nine nonessential amino acids and the apparent digestibility of a variety of feces,as well as the relative expression of jejunal B⁰AT1 mRNA.Compared with the 20% SBM group,the 20% CSP+NE group did not affect piglet organ index and intestinal morphology,but significantly increased piglet body mass and mass gained per day,28 d serum ALT and Cholesterol (CHOL)levels,and significantly reduced diarrhea index.Reducing 5% soybean meal in the diet and using cottonseed protein as the sole protein source did not adversely affect the growth performance,organ index and intestinal morphology of weaned piglets under the same level of essential amino acids,and improved feed intake and diarrhea,but there was a certain level of reduction in the digestibility of non-essential amino acids in the cottonseed protein group,and balancing non-essential amino acids compensated for this loss to some extent,and improved weight gain.Meanwhile,the results also suggested that the moderate consideration of non-essential amino acids in the diet can better meet the overall needs of growth and development of weaned piglets.

Key words: Soybean meal, Cottonseed protein, Protein source, Amino acid, Weaned piglet

CLC Number: 

• S858.28